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FabTally Utility Belt

Registre officiel Cartes, voyage et météo

13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http fabtally-utility-belt 'https://belt.fabtally.com/mcp'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "fabtally-utility-belt": {
            "type": "http",
            "url": "https://belt.fabtally.com/mcp"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. FabTally Utility Belt — MCP server
  2. Tools
  3. Install / run
  4. Paying for paid tools
  5. Guarantees

FabTally Utility Belt — MCP server

The deterministic micro-utilities AI agents call constantly, as an MCP server (stdio + streamable-HTTP) and a pay-per-call HTTP API. One reliable bundle instead of thirteen flaky npm deps.

  • Free tools return real results with no wallet: convert, text, hash, encode, id, regex.
  • Paid tools ($0.001/call, x402 · USDC on Base): timezone, cron, rrule, currency, diff, jsonschema, datemath. With no payment a paid tool returns the decoded x402 402 challenge (price / network / asset / payTo) so an agent can pay and retry with x_payment. Humans can instead prepay by card and use an X-FabTally-Key credit key against the HTTP API.

This server holds no private key. It fronts https://belt.fabtally.com. Every utility is a pure, deterministic function with strict input validation; bad input → 400, never charged; nothing is stored.

Tools

ToolTierWhat it does
convertfreeUnit conversion (length/mass/temperature/volume/data/time/area/speed/angle/pressure/energy).
textfreeslugify · case-convert (camel/pascal/snake/kebab/constant/…) · {{template}} fill.
hashfreesha256/sha512/sha384/sha1/md5/sha3-256/keccak256/ripemd160, optional HMAC, hex/base64 out.
encodefreebase64 / base64url / hex / url / html encode & decode.
idfreeuuid v4/v7, ULID, nanoid, random hex/base64url/int (count up to 1000).
regexfreetest/match/extract/replace with catastrophic-backtracking protection (killable worker + timeout).
timezone$0.001Instant → IANA zone with historically-correct DST; offsets, abbreviations, DST flags.
cron$0.001Cron expression → next N run times + plain-English description.
rrule$0.001iCal RRULE (RFC 5545) → next N occurrences.
currency$0.001Live currency conversion at reference/mid-market rates (keyless ECB feed, cached).
diff$0.001Text diff: unified patch + structured op-list + add/remove/hunk stats.
jsonschema$0.001Validate against JSON Schema (draft 2020-12) and explain every error in plain English.
datemath$0.001Add/subtract ISO-8601 durations, diff into chosen units, business-day add/diff.

Install / run

stdio (Claude Desktop, Cursor, any MCP client)
// claude_desktop_config.json
{
  "mcpServers": {
    "fabtally-belt": { "command": "npx", "args": ["-y", "fabtally-belt-mcp"] }
  }
}

Or clone and run: node index.js (speaks MCP over stdio).

streamable-HTTP (remote)

Hosted: https://belt.fabtally.com/mcp. Or self-host: MCP_HTTP_PORT=8108 node http.js.

Config
  • FABTALLY_BELT_BASE — API base (default https://belt.fabtally.com).

Paying for paid tools

A paid tool with no x_payment returns:

{ "payment_required": true, "http_status": 402,
  "challenge": { "x402Version": 2, "accepts": [ { "scheme": "exact", "network": "eip155:8453",
    "amount": "1000", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0x…" } ] } }

Build an x402 payment authorization (EIP-3009 transferWithAuthorization to payTo) for the accepts entry and call the tool again with the token in x_payment. amount is atomic USDC (1000 = $0.001).

Guarantees

Deterministic. Stateless — no PII or request data stored. Receive-only wallet (no custody). Currency figures are reference/mid-market rates for informational use, not a dealable quote. MIT licensed.

Questions fréquentes

Qu'est-ce que FabTally Utility Belt ?

13 deterministic agent utilities: timezone, cron, RRULE, currency, regex, diff, hashing & more.

Comment installer FabTally Utility Belt ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http fabtally-utility-belt 'https://belt.fabtally.com/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour FabTally Utility Belt ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

FabTally Utility Belt est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient FabTally Utility Belt ?

Il est publié par zvmzaretsky. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.